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Packet radio uses _________ and __________ signals for perfect feedback.

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Packet radio uses _________ and __________ signals for perfect feedback.

(a) Forward, reverse

(b) ACK, NACK

(c) Active, passive

(d) Linear, non linear

I have been asked this question during a job interview.

Asked question is from Packet Radio in portion Multiple Access Techniques for Wireless Communications of Wireless/Mobile

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Right answer is (b) ACK, NACK

Easiest explanation: Packet radio uses ACK and NACK signals for perfect feedback. The ACK signal indicates an acknowledgment of a received burst and NACK indicates that the previous burst was not received correctly by base station.

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